Definition: The associative property states that you can add or multiply regardless of how the numbers are grouped. By 'grouped' we mean 'how you use parenthesis'.
When you are having difficulty breathing, or your chest is tight, or when you are wheezing, Ventolin Rotacaps open up the breathing tubes in your lungs to help with breathing. Because the medicine in your Ventolin Rotacaps gives fast relief from your chest symptoms, it is often called a 'reliever'.
grompp, a preprocessor for simulation input files for GROMACS (a fast, free, open-source code for some problems in computational chemistry) which calls the system C preprocessor (or other preprocessor as determined by the simulation input file) to parse the topology, using mostly the #define and #include mechanisms to determine the effective topology at grompp run time.